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selftests/x86/ioperm: Extend testing so the shared bitmap is exercised

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Add code to the fork path which forces the shared bitmap to be duplicated
and the reference count to be dropped. Verify that the child modifications
did not affect the parent.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Thomas Gleixner 2019-11-11 23:03:26 +01:00
parent 4804e382c1
commit 0907a09c2e
1 changed files with 15 additions and 1 deletions
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16
tools/testing/selftests/x86/ioperm.c
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@ -131,6 +131,17 @@ int main(void)
printf("[RUN]\tchild: check that we inherited permissions\n");
expect_ok(0x80);
expect_gp(0xed);
printf("[RUN]\tchild: Extend permissions to 0x81\n");
if (ioperm(0x81, 1, 1) != 0) {
printf("[FAIL]\tioperm(0x81, 1, 1) failed (%d)", errno);
return 1;
}
printf("[RUN]\tchild: Drop permissions to 0x80\n");
if (ioperm(0x80, 1, 0) != 0) {
printf("[FAIL]\tioperm(0x80, 1, 0) failed (%d)", errno);
return 1;
}
expect_gp(0x80);
return 0;
} else {
int status;
@ -146,8 +157,11 @@ int main(void)
}
}
/* Test the capability checks. */
/* Verify that the child dropping 0x80 did not affect the parent */
printf("\tVerify that unsharing the bitmap worked\n");
expect_ok(0x80);
/* Test the capability checks. */
printf("\tDrop privileges\n");
if (setresuid(1, 1, 1) != 0) {
printf("[WARN]\tDropping privileges failed\n");